<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{path:'/home'}">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-row>
        <!-- 添加角色按钮区域 -->
        <el-col :span="4">
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolesList" stripe border>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom','vcenter',index1===0?'bdtop':'']"
              v-for="(item1,index1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <el-row
                  :class="[index2===0 ? '':'bdtop','vcenter']"
                  v-for="(item2,index2) in item1.children"
                  :key="item2.id"
                >
                  <!-- 渲染二级权限 -->
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeById(scope.row,item2.id)"
                    >{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 渲染三级权限 -->
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeById(scope.row,item3.id)"
                    >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
            <el-button
              type="warning"
              icon="el-icon-setting"
              size="mini"
              @click="showSetRightDialog(scope.row)"
            >分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配角色用的对话框 -->
    <el-dialog
      title="分配角色"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightsDialogClose"
    >
      <!-- 树形控件 -->
      <el-tree
        ref="treeRef"
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
      ></el-tree>
      <span slot="footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="setRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 所有角色列表数据
      rolesList: [],
      // 分配角色的对话框的状态控制
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点Id值数组，但是这个值不是双向的，当手动勾选时此数组的内容不会增加
      defKeys: [],
      // 即将分配角色的id
      roleId: ''

    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) return this.$message.error('获取角色列表失败')
      this.rolesList = res.data
      console.log(this.rolesList)
    },
    // 根据id删除对应的权限
    async removeById (role, rightId) {
      // 弹框询问是否删除
      const conFirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (conFirmResult !== 'confirm') return this.$message.info('取消了删除')
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) { return this.$message.error('删除权限失败') }
      // 使用这句会重新渲染整个表格，会把展开项关闭
      // this.getRolesList()
      // 只需要重新渲染该角色下的二三级权限即可
      role.children = res.data
    },
    // 点击分配角色按钮时
    async showSetRightDialog (role) {
      this.roleId = role.id
      const { data: res } = await this.$http.get('rights/tree')
      // 获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
      // console.log(res)
      if (res.meta.status !== 200) return this.$message.error('获取权限列表失败')
      // 获取到的权限数据保存在data中
      this.rightsList = res.data
      console.log(this.rightsList)
    },
    // 通过递归获取角色所有三级权限的ID，保存到defkeys中
    getLeafKeys (node, arr) {
      // 递归出口
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 当分配权限对话框关闭的时候，清空defKeys
    setRightsDialogClose () {
      this.defKeys = []
    },
    // 点击分配角色对话框中的确定时
    async setRights () {
      // ...是展开字符，
      const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {
        rids: idStr
      })
      if (res.meta.status !== 200) return this.$message.error('更新权限失败')
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }

  }
}
</script>
<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eeeeee;
}
.bdbottom {
  border-bottom: 1px solid #eeeeee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
